The Mg 100Àx Pd x (x ¼ 10, 20 and 30), Mg 80 Ni 20Ày Pd y (y ¼ 5 and 10) and Mg 75 Ni 20 Pd 5 amorphous alloys were prepared by the singleroller melt-spinning technique. The electrical resistance was measured during electrochemical hydrogen charging in 6N KOH solution. The Mg 90 Pd 10 amorphous alloy shows larger increase in the electrical resistance by hydrogen absorption than any other alloys prepared in this study. Moreover, the electrical resistance of those alloys was also measured in hydrogen-dissolved water prepared by the bubbling method. As a result, it was found that the electrical resistance increases with increasing immersion time and that the increase amount of the electrical resistance is dependent on the alloy composition. The increase amount of the electrical resistance of the Mg 90 Pd 10 amorphous alloy is much larger than those of other alloys prepared in this work. The increase amount of the electrical resistance of the Mg 90 Pd 10 amorphous alloy after immersion in hydrogen-dissolved water for 300 s is dependent on the concentration of hydrogen in water, and it increases with increasing hydrogen concentration in water. From these results, it is confirmed that hydrogen absorption has a great influence on the electrical resistance of the Mgbased amorphous alloys and that the sensitivity to hydrogen can change largely depending on the alloy composition even in the similar alloy systems.
We report on the hydrogen sensing property of Pd-capped Mg–Pd alloy thin films which were prepared by dc magnetron sputtering. Pd-capped Mg0.9Pd0.1 films of thicknesses 10 nm Pd and 40 nm Mg–Pd show a good hydrogen sensing property for hydrogen-containing atmosphere at room temperature. Their sensing range is from 40 ppm to 4% hydrogen in Ar. These films are supposed to be candidates for a low-cost room temperature hydrogen sensor.
We investigated the effect of hydrogen on the electrical resistance of melt-spun amorphous alloys. It was found that Mg-based amorphous alloys show the increases in the electrical resistance when they are immersed in hydrogen-dissolved water and that the electrical resistance increases by hydrogen absorption and returns to the initial level by hydrogen desorption. These results show the possibility that the Mg-based amorphous alloys may be applied to hydrogen sensing materials in water.
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